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Interpreting the Fault Extra Data
Bytes 1 - 8:
Ignored when decoding a security-related fault.
Byte 9:
The operation during which the fault occurred.
▪
01 (as in the example): Read
▪
02: Write
Byte 10:
The hexadecimal value (HV) that specifies a CPU memory area.
Hexadecimal
Value (HV)
08
0A
0C
10
12
14
16
18
1A
1C
1E
38
C4
Bytes 11–18:
0-based bit offset of the memory area being accessed. The 8-byte value is encoded in
little endian format, meaning that the byte values are reversed. In the example, the
value is 0x0000000000000006, which is equal to 1-based bit offset 7.
Bytes 19–22:
The length in bits of data requested. In the example, 1 bit was requested.
Bytes 23–24:
Ignored when decoding a security-related fault.
GFK-2950C
Memory area
%R (Register memory)
%AI (Analog input memory)
%AQ (Analog output memory)
%I (Discrete input memory)
%Q (Discrete output memory)
%T (Discrete temporary status memory)
%M (Discrete momentary internal memory)
%SA (Discrete system memory A)
%SB (Discrete system memory B)
%SC (Discrete system memory C)
%S (Discrete system memory)
%G (Genius global memory)
%W (Bulk Memory)
February 2018
Chapter 9. Diagnostics
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